HDDs are also standard in the 2.3 GHz and 3.0 GHz iMacs. Fusion, which includes a HDD, is standard in all the other iMacs except the iMac Pro. SSD is available as an option across the range, as is the case with the mid and top of the Mac Mini range.
Like it or not HDD is likely to remain around for a while in desktop computers as it is remains the most cost effective storage option by far when storage of large amounts of data is the priority.
Don't like it?
You don't have to have HDD. Stump up a lot more cash for SSD and you get the snappy performance you desire, or require.
Your money, your choice.....